Rotary pump



3 E. J. WENDELL 1,781,619

ROTARY PUMP Filed Oct 14, 1926 T O /2 M R f a O ///%r favuzlah 63mm?Jlfiywkll,

63 into Mas M Patented Nov, 11, 1930 UNITED STATES EVERT J. WENDELL, OFWAYNE, PENNSYLVANIA ROTARY PUMP Application filed October 14, 1926.Serial No. 141,596.

This invention relates primarily to improvements in rotary pumps of thetype employing geared, cooperating rotors. The

prmcipal object of the invention is to pro-- 9 10 the invention is toprovide a novel mounting for rotor shafts more or less positivelyretaining the rotors in parallel alignment and largely eliminatingdistortion or flexing of the shafts.

In the attached drawings:

Figure 1 is a transverse section through a pump of the class to whichthe present invention primarily relates, and

Fig. 2 is a section on the line 22, Fig. 1.

With reference to the drawings, the pump as illustrated comprises acasing 1 having intake ports 2, 2 and discharge ports 3, 3, these portsconnecting respectively with intake and discharge channels, 4 and 5respec- -tively. Intermediate the channels/1 and 5 is a chamber 6 inwhich are mounted cooperating rotors 7 and 8. These rotors are mountedrespectively on shafts 9 and 10 which are eared together by gears 11 and12, and are ]ournaled in the ump casing, as hereinafter described. The saft. 9 also carries a gear 17 through which power is applied to theshaft to drive the rotors. The operation of this type of pump is wellunderstood in the art, and in the drawings I have indicated by means ofarrows the flow in and through the pump casing from the intake to thedischarge ports.

By reason of the high rate of speed at which the rotors of this ty e ofump are operated and by reason furt er 0 the relatively high pressuresset up in the casing and between the two rotors, there has been atendency for the shafts to bender flex in operation, with the resultthat true parallel alignment of the shafts is destroyed and theefficiency of the pump correspondingly adversely afi'ected. I

It is the object ofthe present invention to overcome these defects andthereby to provide a pump having relatively high efficiency inoperation.

Referring to Fig. 2, showing a longitudinal section through one of theshafts, it will be noted that the shaft is supported upon two mainbearings 13 and 14 in the pump frame or casing. These bearings areplaced as close to the ends of the rotor as is consistant with adequatepacking of the casing ports through which the shaft 9 extends. Inaddition to the bearings 13 and 14, I provide at the ends of the shaftadditional bearings 15 and 16, preferably of the thrust type, and whichfunction not only to fix the axis of the shaft but also prevent axialmovement of the shaft in the main bearings. It will be understood thatfor any flexure of the shaft adjacent the ends of the rotor there isnormal- 1y a corresponding movement of the shaft extremities, andaccordingly by placing the bearings 15 and 16 at the ends of the shaft Ilargely overcome the tendency of the shaft to flex in operation, aspreviously described. I thereby not only obtain a considerable increasein operating efliciency, due to the more positive maintenance of therotors in true parallel alignment, but also effectively prevent fatigueand eventual rupture of the shaft' I claim:

1 A liquidrotary pump comprising a casing, coacting rotors in saidcasing, shafts for said rotors extending through the casing at bothends, a plurality of bearings for each shaft extremity, said bearingsbeing spaced apart, with one bearing of each set located in sufficientlyclose proximity to the rotor to prevent local flexure in theintermediate rotorcarrying portions of the shafts, and i said bearingscooperating to maintain all portions of the respective shaftsinsubstantial alignment.

2. A liquid rotary pump comprising a casing,coact1ng rotors in saidcasing, shafts for said rotors extending through the casing at both endsof the rotors, packing means for the joints between the casing and theshafts, and a plurality of bearings for each projecting shaft extremityoutwardly of said acking means, the bearings of each set being EVERT J.WENDELILILW

